Design for inspiratory muscle trainer



FIG. 1 is a perspective view of an inspiratory muscle trainer showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an end elevational view thereof as seen from the right of FIG. 2;

FIG. 4 is a side elevational view thereof;

FIG. 5 is an elevational view thereof as seen from the opposite end of FIG. 3;

FIG. 6 is a bottom plan view thereof.

The broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an inspiratory muscle trainer, substantially as shown and described. 